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Heidelberg 2015 – wissenschaftliches Programm

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Q: Fachverband Quantenoptik und Photonik

Q 56: Nano-Optics III

Q 56.4: Vortrag

Donnerstag, 26. März 2015, 15:15–15:30, C/HSO

Ultra-bright emission of indistinguishable photons from deterministic quantum-dot microlenses — •Alexander Thoma, Peter Schnauber, Manuel Gschrey, Marc Seifried, Ronny Schmidt, Jan-Hindrik Schulze, Tobias Heindel, Sven Rodt, André Strittmatter, and Stephan Reitzenstein — Institut für Festkörperphysik, Technische Universität Berlin, Hardenbergstraße 36, D-10623, Germany

Quantum emitters capable of generating single indistinguishable photons at high rates constitute an essential building block for the field of quantum information technology - and in particular for the quantum repeater concept. Promising candidates to realize such sources are single semiconductor quantum dots (QDs) integrated into photonic microstructures. However, the progress achieved so far in this field is mainly based on devices realized on spatially and spectrally random emitter technologies.
Here, we report on a novel deterministic device concept based on the fabrication of single QD microlenses utilizing in-situ electron beam lithography. We show that such quantum light sources can be realized with very high process yield >90% and enable ultra-bright triggered emission. Photon extraction efficiencies up to (23.3 ± 3.0)% in combination with a strong suppression of multi-photon emission events g(2)(0)<0.01 are realized. Furthermore Hong-Ou-Mandel-type two-photon interference experiments reveal a visibility of V=(43 ± 4)% even at saturation of the QD emitter.

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